In Croatia, Jost families are Croats (from Osijek area ). In the past century, relatively most of Croatian residents bearing this family name were born in Orahovica area and in Osijek.
Prevalence
About 10 people with faimily name Jost live in Croatia today, in five households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are only located in threee Croatian cities and two other places, mostly in Antunovac in Osijek area (<10), Vukovar (<5), Pleternica (<5), Zagreb (<5), and in Vrpolje in Djakovo area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.